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With the consequences of human activities pushing Earth into a
sixth mass extinction, a team of biologists have calculated that plant and animal species are being wiped out so quickly that evolution cannot keep up.

Human activities—including
pollution, deforestation, overpopulation, poaching, warming oceans and extreme weather events tied to climate change—are predicted to drive so many mammals to extinction in the next five decades that nature will need somewhere between 3 to 7 million years to restore biodiversity levels to where it was before modern humans evolved, according to an alarming new analysis published Monday in the Proceedings of the National Academy of Sciences.